A Windows virus hit the display consoles in the control room of the Australian national electricity grid, presumably leaving the managers bind to the system status. Luckily, system administrators had Linux-based systems for development that could be swapped out for the disabled Windows machines. It seems as much of a failure to properly maintain the Windows machines as a failure of judgment in using a virus-susceptible OS for mission critical systems, but it's fun schadenfreude fodder for Windows haters.